Alternate Design/Alternate Bid Process for Pavement-Type Selection (2017) / Chapter Skim
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36 CHAPTER SIX ALTERNATE DESIGN/ALTERNATE BID CASE STUDIES INTRODUCTION "MoDOT let 187 ADAB projects worth $2.2 billion. An average of 5.7 bidders competed for ADAB projects as opposed to 4.5 on conventional paving projects.
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37 INDIANA DEPARTMENT OF TRANSPORTATION INDOT chose the US-31 at Kokomo, Indiana, project for its first ADAB project and constructed it under the SEP-14 program. In the SEP-14 application, the following goals were cited as the motivation for experimenting with ADAB: 1.
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38 As Table 9 shows, the LCC factor influenced the final outcome as the lowest HMA bid was below the lowest PCC bid price. Nevertheless, both low bids were below the engineer's estimated cost for the pavement types, indicating that the increased competition resulted in reducing the proposed costs of both pavement types.
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39 • "INDOT saved $3,800,000 immediately at the bid openings; • INDOT saved approximately $10,000,000 over the 50 year service life; • INDOT saved the taxpayers approximately $28,600,000 by being an additional 5.7% under the engineer's estimate" (Duncan and Holtz 2012)
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40 US-171 ADAB Project • Scope of Work: 4.1-mi section of a four-lane highway overlay • Design Alternatives: HMA Overlay versus PCC Bonded Overlay • Life-Cycle Cost Input Values: – 30-year analysis period for overlays (40 years is typical for new construction) – Current unit prices from LaDOTD database – Discount rate = 4% – NPW analysis with future activities included is shown in Table 12.
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41 project will be let as an ADAB project. According to Brown (2010)
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42 TABLE 14 US-31 BID ANALYSIS SUMMARY PCC Bid Price EUAC Lane Rentalb Bid Analysis A+C - Lane Rentala Ramps Freeway A $11,792,980 $725,768 $111,640 $413,502 $11,993,606 B $12,659,041 $775,229 $88,137 $635,140 $12,710,993 C $13,745,871 $837,869 $111,640 $625,216 $13,846,884 D $13,796,513 $840,190 $104,902 $527,629 $14,004,172 HMA E $15,475,645 $961,332 $111,640 $330,802 $15,994,535 Source: Adapted from Mikesell (2012)
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43 of the project was capped at $535 million and the DB team that proposed the most scope for that price won. Contractors performed the pavement design alternatives.
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44 • Difference -- $16,647,446 (1.9%) • When the LCC factor is applied, the difference is 5.6%.
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45 and Smith 1998; Tinni 2013)
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46 Adjustment Factor: NPW Future Asphalt Rehab – NPW Future Concrete Rehab Low bidder: Low bidder = lower of (PCC Bid Price + NPW Future Concrete M&R)
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47 FIGURE 15 TxDOT APDAT flowchart (Wimsatt et al.
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48 The first step involves collecting project specific information and then filtering it through a series of Go/No Go parameters to determine whether to proceed. The initial filters are defined as project characteristics that make the project "unsuitable for offering alternative pavement design" (Wimsatt et al.
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49 A number of conclusions can be drawn from the case study analysis and are described as follows: 1. In each case study, implementing ADAB increased competition by allowing both HMA and PCC paving contractors to bid on the same job.
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